Hey, so sorry for the delay! Unfortunately, neither of these really seem to have a strong enough reason behind them. With the second, simply a comment asking about something from a memory Echo wouldn't really be enough to trigger an Echo unless it happens to mirror a particular event from canon in some way. And, while the first might be enough, the fact that she's already been pinged from the conversation makes us think it's kind of pushing it....

Again, sorry for the wait, especially with bad news presented. If you can come up with something else or a better explanation of cause, please don't hesitate to say so.